feat: add countFalsy to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/lib/index.js

@@ -202,6 +202,15 @@ setReadOnly( ns, 'char2dtype', require( '@stdlib/ndarray/base/char2dtype' ) );
 */
 setReadOnly( ns, 'clampIndex', require( '@stdlib/ndarray/base/clamp-index' ) );
 
+/**
+* @name countFalsy
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/base/count-falsy}
+*/
+setReadOnly( ns, 'countFalsy', require( '@stdlib/ndarray/base/count-falsy' ) );
+
 /**
 * @name countTruthy
 * @memberof ns